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Condensed Information Safety and Use v Specifications vii Abridged Command List xi Getting Started Introduction 1-1 CW Function Generation 1-1 Frequency Sweep 1-2 Tone Bursts 1-3 Operation Introduction to DDS 2-1 DS345 Features 2-5 Front Panel Features 2-5 Rear Panel Features 2-7 Function Setting 2-9 Setting the Function 2-10 Frequency 2-10 Amplitude 2-11 DC Offset 2-12 Phase 2-12 Sweeps and Modulation 2-13 Modulation Parameters 2-13 Modulation On/Off 2-13 Modulation Type 2-13 Modulation Rate 2-14 Amplitude Modulation 2-15 External AM 2-15 Internal AM 2-15 Frequency Modulation 2-16 Phase Modulation 2-17 Burst Modulation 2-18 Burst Count 2-18 Starting Point 2-18 Frequency Sweeps 2-19 Sweep Type 2-19 Sweep Frequencies 2-19 Sweep Markers 2-20 Sweep Outputs 2-21 Trigger Generator 2-22 Arbitrary Modulation Patterns 2-23 Pulse Generation 2-24 Instrument Setup 2-25 Default Settings 2-25 Store and Recall 2-25 GPIB and RS232 Setup 2-26 Self-Test and Autocal 2-27 Arbitrary Waveform Editing 2-29 Edit Menu 2-29 Point Format Editing 2-30 Point Format Example 2-31 Vector Format Editing 2-32 Vector Format Example 2-33 Programming Programming the DS345 3-1 Communications 3-1 GPIB Communication 3-1 RS-232 Communication 3-1 Data Window 3-1 Command Syntax 3-1 Detailed Command List 3-3 Function Output Commands 3-3 Modulation Control 3-4 Arb Waveform and Modulation 3-6 Setup Control Commands 3-9 Status Reporting Commands 3-9 Test and Calibration Commands 3-10 Status Byte Definitions 3-12 Programming Examples 3-15 Arbitrary AM Modulation 3-16 Arbitrary FM Modulation 3-17 Arbitrary PM Modulation 3-18 Point Mode Arb Waveform 3-19 Vector Mode Arb Waveform 3-20 Test and Calibration Troubleshooting 4-1 Operation Error Messages 4-1 Self-Test Error Messages 4-3 Autocal Error Messages 4-4 Performance Tests 5-1 Necessary Equipment 5-1 Functional Tests 5-2 Front Panel Test 5-2 Self Tests 5-2 Sine Wave 5-2 Square Wave 5-2 Amplitude Flatness 5-3 Output Level 5-3 Performance Tests 5-5 Frequency Accuracy 5-5 Amplitude Accuracy 5-5 DC Offset Accuracy 5-7 Subharmonics 5-7 Spurious Signals 5-8 Harmonic Distortion 5-8 Phase Noise 5-9 Square Wave Rise Time 5-10 Square Wave Symmetry 5-10 AM Envelope Distortion 5-10 Test Scorecard 5-11 Calibration 6-1 Introduction 6-1 Calibration Enable 6-1 Calbytes 6-1 Necessary Equipment 6-3 Adjustments 6-3 Clock Adjustment 6-3 DAC Reference Voltage 6-4 Output Amplifier Bandwidth 6-4 Bessel Filter Adjustment 6-4 Harmonic Distortion 6-5 Calibration 6-6 5.00 V Reference 6-6 Clock Calibration 6-6 Attenuator Calibration 6-6 Carrier Null Calibration 6-7 Sinewave Amplitude 6-8 Square Wave Amplitude 6-8 Square Wave Symmetry 6-9 Arbitrary Waveform Software Introduction 7-1 Getting Started with AWC 7-1 Hardware Requirements 7-3 Menus 7-3 File Menu 7-3 Edit Menu 7-3 Waveform Menu 7-4 Send Data Menu 7-5 Set DS345 Menu 7-5 Trigger Menu 7-6 Zoom Menu 7-6 Other Menu 7-7 Mouseless Operation 7-7 File Format 7-7 DS345 Circuitry Circuit Description 8-1 Bottom PC Board 8-1 Power Supplies 8-1 Microprocessor System 8-1 Display and Keyboard 8-1 Ribbon Cable, Trigger and Sync 8-2 GPIB and RS232 Interfaces 8-2 Output Amplifier 8-3 Output Attenuator 8-3 Top PC Board 8-4 Ribbon Cable, ADC, DACs 8-4 Clocks 8-4 DDS ASIC and Memory 8-5 Amplitude and Sweep DACs 8-5 DDS Waveform DAC 8-6 DDS Output Filters and Doubler 8-6 Sync and Gain Adjust 8-6 Component Parts List 9-1 Bottom PC Board and Front Panel 9-1 Top PC Board 9-10 Optional PC Board 9-20 Miscellaneous Parts 9-22